ref: eae89a7f07a8af7304ca258f77d74cd3a8af72ee
dir: /src/autofit/afglobal.c/
/***************************************************************************/ /* */ /* afglobal.c */ /* */ /* Auto-fitter routines to compute global hinting values (body). */ /* */ /* Copyright 2003, 2004, 2005, 2006, 2007, 2008, 2009 by */ /* David Turner, Robert Wilhelm, and Werner Lemberg. */ /* */ /* This file is part of the FreeType project, and may only be used, */ /* modified, and distributed under the terms of the FreeType project */ /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ /* this file you indicate that you have read the license and */ /* understand and accept it fully. */ /* */ /***************************************************************************/ #include "afglobal.h" #include "afdummy.h" #include "aflatin.h" #include "afcjk.h" #include "afindic.h" #include "afpic.h" #include "aferrors.h" #ifdef FT_OPTION_AUTOFIT2 #include "aflatin2.h" #endif #ifndef FT_CONFIG_OPTION_PIC /* when updating this table, don't forget to update AF_SCRIPT_CLASSES_COUNT and autofit_module_class_pic_init */ /* populate this list when you add new scripts */ static AF_ScriptClass const af_script_classes[] = { &af_dummy_script_class, #ifdef FT_OPTION_AUTOFIT2 &af_latin2_script_class, #endif &af_latin_script_class, &af_cjk_script_class, &af_indic_script_class, NULL /* do not remove */ }; #endif /* FT_CONFIG_OPTION_PIC */ /* index of default script in `af_script_classes' */ #define AF_SCRIPT_LIST_DEFAULT 2 /* a bit mask indicating an uncovered glyph */ #define AF_SCRIPT_LIST_NONE 0x7F /* if this flag is set, we have an ASCII digit */ #define AF_DIGIT 0x80 /* * Note that glyph_scripts[] is used to map each glyph into * an index into the `af_script_classes' array. * */ typedef struct AF_FaceGlobalsRec_ { FT_Face face; FT_UInt glyph_count; /* same as face->num_glyphs */ FT_Byte* glyph_scripts; AF_ScriptMetrics metrics[AF_SCRIPT_MAX]; } AF_FaceGlobalsRec; /* Compute the script index of each glyph within a given face. */ static FT_Error af_face_globals_compute_script_coverage( AF_FaceGlobals globals ) { FT_Error error = AF_Err_Ok; FT_Face face = globals->face; FT_CharMap old_charmap = face->charmap; FT_Byte* gscripts = globals->glyph_scripts; FT_UInt ss, i; /* the value 255 means `uncovered glyph' */ FT_MEM_SET( globals->glyph_scripts, AF_SCRIPT_LIST_NONE, globals->glyph_count ); error = FT_Select_Charmap( face, FT_ENCODING_UNICODE ); if ( error ) { /* * Ignore this error; we simply use the default script. * XXX: Shouldn't we rather disable hinting? */ error = AF_Err_Ok; goto Exit; } /* scan each script in a Unicode charmap */ for ( ss = 0; AF_SCRIPT_CLASSES_GET[ss]; ss++ ) { AF_ScriptClass clazz = AF_SCRIPT_CLASSES_GET[ss]; AF_Script_UniRange range; if ( clazz->script_uni_ranges == NULL ) continue; /* * Scan all unicode points in the range and set the corresponding * glyph script index. */ for ( range = clazz->script_uni_ranges; range->first != 0; range++ ) { FT_ULong charcode = range->first; FT_UInt gindex; gindex = FT_Get_Char_Index( face, charcode ); if ( gindex != 0 && gindex < globals->glyph_count && gscripts[gindex] == AF_SCRIPT_LIST_NONE ) { gscripts[gindex] = (FT_Byte)ss; } for (;;) { charcode = FT_Get_Next_Char( face, charcode, &gindex ); if ( gindex == 0 || charcode > range->last ) break; if ( gindex < globals->glyph_count && gscripts[gindex] == AF_SCRIPT_LIST_NONE ) { gscripts[gindex] = (FT_Byte)ss; } } } } /* mark ASCII digits */ for ( i = 0x30; i <= 0x39; i++ ) { FT_UInt gindex = FT_Get_Char_Index( face, i ); if ( gindex != 0 && gindex < globals->glyph_count ) gscripts[gindex] |= AF_DIGIT; } Exit: /* * By default, all uncovered glyphs are set to the latin script. * XXX: Shouldn't we disable hinting or do something similar? */ { FT_UInt nn; for ( nn = 0; nn < globals->glyph_count; nn++ ) { if ( gscripts[nn] == AF_SCRIPT_LIST_NONE ) gscripts[nn] = AF_SCRIPT_LIST_DEFAULT; } } FT_Set_Charmap( face, old_charmap ); return error; } FT_LOCAL_DEF( FT_Error ) af_face_globals_new( FT_Face face, AF_FaceGlobals *aglobals ) { FT_Error error; FT_Memory memory; AF_FaceGlobals globals; memory = face->memory; if ( !FT_ALLOC( globals, sizeof ( *globals ) + face->num_glyphs * sizeof ( FT_Byte ) ) ) { globals->face = face; globals->glyph_count = face->num_glyphs; globals->glyph_scripts = (FT_Byte*)( globals + 1 ); error = af_face_globals_compute_script_coverage( globals ); if ( error ) { af_face_globals_free( globals ); globals = NULL; } } *aglobals = globals; return error; } FT_LOCAL_DEF( void ) af_face_globals_free( AF_FaceGlobals globals ) { if ( globals ) { FT_Memory memory = globals->face->memory; FT_UInt nn; for ( nn = 0; nn < AF_SCRIPT_MAX; nn++ ) { if ( globals->metrics[nn] ) { AF_ScriptClass clazz = AF_SCRIPT_CLASSES_GET[nn]; FT_ASSERT( globals->metrics[nn]->clazz == clazz ); if ( clazz->script_metrics_done ) clazz->script_metrics_done( globals->metrics[nn] ); FT_FREE( globals->metrics[nn] ); } } globals->glyph_count = 0; globals->glyph_scripts = NULL; /* no need to free this one! */ globals->face = NULL; FT_FREE( globals ); } } FT_LOCAL_DEF( FT_Error ) af_face_globals_get_metrics( AF_FaceGlobals globals, FT_UInt gindex, FT_UInt options, AF_ScriptMetrics *ametrics ) { AF_ScriptMetrics metrics = NULL; FT_UInt gidx; AF_ScriptClass clazz; FT_UInt script = options & 15; const FT_UInt script_max = sizeof ( AF_SCRIPT_CLASSES_GET ) / sizeof ( AF_SCRIPT_CLASSES_GET[0] ); FT_Error error = AF_Err_Ok; if ( gindex >= globals->glyph_count ) { error = AF_Err_Invalid_Argument; goto Exit; } gidx = script; if ( gidx == 0 || gidx + 1 >= script_max ) gidx = globals->glyph_scripts[gindex] & AF_SCRIPT_LIST_NONE; clazz = AF_SCRIPT_CLASSES_GET[gidx]; if ( script == 0 ) script = clazz->script; metrics = globals->metrics[clazz->script]; if ( metrics == NULL ) { /* create the global metrics object when needed */ FT_Memory memory = globals->face->memory; if ( FT_ALLOC( metrics, clazz->script_metrics_size ) ) goto Exit; metrics->clazz = clazz; if ( clazz->script_metrics_init ) { error = clazz->script_metrics_init( metrics, globals->face ); if ( error ) { if ( clazz->script_metrics_done ) clazz->script_metrics_done( metrics ); FT_FREE( metrics ); goto Exit; } } globals->metrics[clazz->script] = metrics; } Exit: *ametrics = metrics; return error; } FT_LOCAL_DEF( FT_Bool ) af_face_globals_is_digit( AF_FaceGlobals globals, FT_UInt gindex ) { if ( gindex < globals->glyph_count ) return (FT_Bool)( globals->glyph_scripts[gindex] & AF_DIGIT ); return (FT_Bool)0; } /* END */